It really depends on what you want to do. If you're only turning a fan to exhaust a paint shop, use ac. If you're driving a newsprint roller and you want the print to line up, use dc. There are thousands of different applications, each different. And, there are variations on motors, like variable reluctance, VFD, etc, etc, etc.
Can you describe your application, please?
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Check any book on electrical drives, The advantages and disadvantages are clearly spelt out (or at least they used to be in out time)
Select beasd on your application, when advanytages out-weigh the disadvantages.
Hi LL, the type of power available is usually not a constraint, we some time rectify the AC to DC to drive motors, quite a few in our factory in machine tools.
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AC Motor or DC Motor 
Re: AC Motor or DC Motor
